Sodium Sulphate - Na2SO4

SODIUM SULPHATE
PRODUCT IDENTIFICATION
CAS NO.7757-82-6 (Anhydrous)
7727-73-3 (Decahydrate)

EINECS NO.231-820-9
FORMULANa2SO4
MOL WT.142.04
H.S. CODE2833.11
TOXICITY
SYNONYMSDisodium monosulfate; Sulfuric acid, Sodium salt;
Disodium sulfate; Sodium sulfate; Sulfuric acid, sodium salt; Sulfuric acid, Disodium salt;Sulfuric acid disodium salt; Salt cake; Bisodium sulfate; Sodium sulfate (2:1); Thenardite; Natriumsulfat; Trona;
DERIVATION
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATEHygroscopic white powder, Odorless
MELTING POINT 880 - 888 C
BOILING POINT1100 C (Decomposes)
SPECIFIC GRAVITY 2.66 - 2.75
SOLUBILITY IN WATERSoluble
pHAqueous solution is neutral
VAPOR DENSITY
AUTOIGNITION
NFPA RATINGSHealth: 1; Flammability: 0; Reactivity: 0
REFRACTIVE INDEX
FLASH POINT
STABILITYStable under ordinary conditions
GENERAL DESCRIPTION & APPLICATIONS
Sodium sulfate is a white, orthorhombic crystalline solid at room temperatures ( a monoclinic structure at > 100 C, a hexagonal structure at > 250C). It is reduced to sodium sulfide at high temperature. But sodium sulfate is a stable compound which does not decompose and does not react with oxidising or reducing agents at normal temperatures. It is neutral (pH of 7) in water. Sodium sulfate is most soluble in water at 32.4 C (49.7g/100 g). Commercial major source of sodium sulfate is salt cake (impure sodium sulfate), a by-product of hydrochloric acid production from sodium chloride by treatment with sulfuric acid. Sodium sulfate is obtained also as a byproduct of rayon production and sodium dichromate production. The decahydrate is known as Glauber's salt. About half of the world's production is from the natural mineral form of the decahydrate (mirabilite). Anhydrous sodium sulfate is found in nature as the mineral thenardite (Na2SO4). Other sodium sulfate minerals are metasideronatrite Na4Fe2(SO4)4(OH)213H2O, krohnkite Na2Cu(SO4)212H2O, and schairerite Na3(SO4)(F,Cl). Sodium sulfate is consumed in four major categories; powder detergents as a processing aid and as a filler, wood pulp processing for making kraft paper, textile dyeing processes as a levelling agent to penetrate evenly, and molten glass process to remove small air bubbles. Sodium sulfate is employed also as a raw material for the production of various chemicals.
SALES SPECIFICATION
APPEARANCE white powder
Na2SO4 99.0% min
WATER INSOLUBLES 0.05% max
Mg 0.15% max
Cl 0.35% max
Fe 0.002% max
pH Neutral to slightly alkaline
MOISTURE0.2% max
WHITENESS80% min
PARTICLE SIZE50% (100 mesh)
TRANSPORTATION
PACKING25kgs, 50kgs, 1mt in Bag
HAZARD CLASSNot regulated
UN NO.
OTHER INFORMATION
Sulfate (also spelled sulphate in Europe) is any chemical compound containing the SO42- ion related to sulfuric acid (H2SO4). Sulfates are salts or esters of sulfuric acid, formed by replacing one or both of the hydrogens with a metal or a radical as in sodium sulfate, Na2SO4. Sulfates in which both hydrogens are replaced are called normal sulfates. Bisulfate is a compound that has the HSO4- radical. Bisulfate (called also hydrogen sulfate or acid sulfate) is a compound formed by replacing only one hydrogen in sulfuric acid. Sulfite (also sulphite) is a compound that contain the sulfite ion SO32-. Sulfites are salts or esters of sulfurous acid (H2SO3), formed by replacing one or both of the hydrogens with a metal or a radical as in sodium sulfite, Na2SO3. Sulfites in which both hydrogens are replaced are called normal sulfites. Bisulfite is a compound that has the HSO3- radical. Bisulfate (called also hydrogen sulfite or acid sulfite) is a compound formed by replacing only one hydrogen in sulfurous acid. The term of 'meta' or 'pyro' is the chemical prefix for oxo acid formed through the loss of one water molecule (dehydration) from two molecules of ortho acid by heating. Pyrosulfuric acid is an example ( 2H2SO4 - H2O = H2S2O7). Ortho acid is the compound fully hydrated acid or its salts. Orthophosphoric acid is an example (2•H3PO4 = P2O5.3H2O), in contrast to the less hydrated form, pyrophosphoric acid (2•HPO3 = P2O5.H2O). Na2O5S2 is called sodium metabisulfite (2•HNaO3S - H2O). Sulfide is a compound having one or more sulfur atoms in which the sulfur is connected directly to a carbon, metal, or other nonoxygen atom; for example sodium sulfide, Na2S. Sulfide ion is S2- with oxidation number -2. Bisulfide ion is an anion formed by two sulfur atoms having an overall -2 charge, (S2)2-. Sulfamate is a salt of sulfamic acid (HSO3NH2). Calcium sulfamate Ca(SO3NH2)2 is an example.